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Tue 25 Jul, 2017 11:46 am
Darkness had fallen when they moved up to the Vejle bank, but locating the Wrestler was easy - her identification challenge ten minutes ago had given her approximate position, and now her squat bulk loomed high before them, a knife-edged silhouette against the pale afterglow of sunset.
@maradona2017,
A challenge is a sentry's call or demand for identification. Here, MacLean is referring to it as the Wrestler's response to HMS Ulysses' challenge.